Capacity planning

Capacity planning: solving the problem of machine expansion and when to expand capacity

The following examples are illustrated

First of all, get the basic data information of a machine (preferably through operation and maintenance):

For example, the server can support 1000 dynamic requests / s and static traffic 400MB/s.

Suppose the system has 960000 page refreshes per hour. By default, each page refresh contains 1-3 dynamic requests.

Estimated current number of requests: 960000 * 3600000800 / s

If the number of requests in the future is 10 times that of the present, that is, 800,10,000 / s

Estimate how many machines are needed: 8000 / 1000 = at least 8

It is estimated that there are about 50 static files (image js css, etc.) per page, and each file is about 40KB

Similarly, there are 960000 page refreshes per hour

Calculate the static file size per page: 50 * 40 = 2000KB

Calculate the traffic of 960000 page refreshes: 960000 * 2000KB / 1024 / 3600 = 520.83MB/s

520.83MB / s > 400MB/s, so one machine is not enough

If the future traffic peak may reach 5G/s

Estimate how many machines are needed: 5*1024MB / 400 = at least 13 machines